Some JavaScript detection functions that are often used

javascript| functions//function Name:trim
Function Description: Removing the trailing spaces of a string
Creation Date:2004-7-13 15:30
Last Modify by:n/a
Last Modify date:n/a
String.prototype.trim=function () {
Return This.replace (/(^\s*) | ( \s*$)/g, "");
}

Function Name:ltrim
Function Description: Remove space on the left side of a string
Creation Date:2004-7-13 9:58
Last Modify by:n/a
Last Modify date:n/a
String.prototype.ltrim=function ()
{
Return This.replace (/(^\s*)/g, "");
}

Function Name:rtrim
Function Description: Remove the space on the right side of the string
Creation Date:2004-7-13 15:31
Last Modify by:n/a
Last Modify date:n/a
String.prototype.rtrim=function ()
{
Return This.replace (/(\s*$)/g, "");
}

Function Name:len
Function Description: Returns the actual length of the string, one Chinese character counts 2 lengths
Creation Date:2004-7-13 9:58
Last Modify by:n/a
Last Modify date:n/a
String.prototype.len=function ()
{
var str=this;
Return Str.replace (/[^\x00-\xff]/g, "* *"). length
}

Function name:isvaliddate
Function Description: Determines whether the input is a valid short date format-"YYYY-MM-DD"
Creation Date:2004-7-13 9:58
Last Modify by:n/a
Last Modify date:n/a
String.prototype.isvaliddate=function ()
{
var result=this.match (/^ (\d{1,4}) (-|\/) (\d{1,2}) \2 (\d{1,2}) $/);
if (result==null) return false;
var d=new Date (Result[1], result[3]-1, result[4]);
Return (D.getfullyear () ==result[1]&&d.getmonth () +1==result[3]&&d.getdate () ==result[4]);
}

Function Name:isvalidtime
Function Description: Determines whether the input is a valid time format-"HH:MM:SS"
Creation Date:2004-7-13 9:58
Last Modify by:n/a
Last Modify date:n/a
String.prototype.isvalidtime=function ()
{
var resule=this.match (/^ (\d{1,2}) (:)? \d{1,2}) \2 (\d{1,2}) $/);
if (result==null) return false;
if (result[1]>24 | | result[3]>60 | | result[4]>60) return FALSE;
return true;
}

Function Name:isvalidemail
Function Description: Determines whether the input is a valid e-mail message
Creation Date:2004-7-13 9:59
Last Modify by:n/a
Last Modify date:n/a
String.prototype.isvalidemail=function ()
{
var result=this.match (-\w+) | (/^\w+) | ( \.\w+)) *\@[a-za-z0-9]+ (\.| -) [a-za-z0-9]+) *\. [a-za-z0-9]+$/);
if (result==null) return false;
return true;
}

Function Name:isvaliddatetime
Function Description: Determines whether the input is a valid long date format-"Yyyy-mm-dd HH:MM:SS"
Creation Date:2004-7-13 9:59
Last Modify by:n/a
Last Modify date:n/a
String.prototype.isvaliddatetime=function ()
{
var result=this.match (/^ (\d{1,4}) (-|\/) (\d{1,2}) \2 (\d{1,2}) (\d{1,2}):(\d{1,2}):(\d{1,2);
if (result==null) return false;
var d= new Date (result[1], result[3]-1, result[4], result[5], result[6], result[7]);
Return (D.getfullyear () ==result[1]&& (D.getmonth () +1) ==result[3]&&d.getdate () ==result[4]& &d.gethours () ==result[5]&&d.getminutes () ==result[6]&&d.getseconds () ==result[7]);
}

Function Name:isvalidinteger
Function Description: Determines whether the input is an integer
Creation Date:2004-7-13 10:01
Last Modify by:n/a
Last Modify date:n/a
String.prototype.isvalidinteger=function ()
{
var result=this.match (/^ (-|\+)? \d+$/);
if (result==null) return false;
return true;
}

Function Name:isvalidpositiveinteger
Function Description: Determines whether the input is a positive integer
Creation Date:2004-7-13 10:01
Last Modify by:n/a
Last Modify date:n/a
String.prototype.isvalidpositiveinteger=function ()
{
var result=this.match (/^\d+$/);
if (result==null) return false;
if (parseint (this) >0) return true;
return false;
}

Function Name:isvalidnegativeinteger
Function Description: Determines whether the input is a negative integer
Creation Date:2004-7-13 10:28
Last Modify by:n/a
Last Modify date:n/a
String.prototype.isvalidnegativeinteger=function ()
{
var result=this.match (/^-\d+$/);
if (result==null) return false;
return true;
}

Function Name:isvalidnumber
Function Description: Determines whether the input is a number
Creation Date:2004-7-13 10:01
Last Modify by:n/a
Last Modify date:n/a
String.prototype.isvalidnumber=function ()
{
Return!isnan (this);
}

Function name:isvalidletters
Function Description: Determines whether the input is a A-z/A-Z string
Creation Date:2004-7-13 10:10
Last Modify by:n/a
Last Modify date:n/a
String.prototype.isvalidletters=function ()
{
var result=this.match (/^[a-za-z]+$/);
if (result==null) return false;
return true;
}

Function name:isvaliddigits
Function Description: Determines whether the input is a number consisting of 0-9
Creation Date:2004-7-13 10:10
Last Modify by:n/a
Last Modify date:n/a
String.prototype.isvaliddigits=function ()
{
var result=this.match (/^[1-9][0-9]+$/);
if (result==null) return false;
return true;
}

Function Name:isvalidalphanumeric
Function Description: Determines whether the input is a string composed of 0-9/A-z/A-Z
Creation Date:2004-7-13 10:14
Last Modify by:n/a
Last Modify date:n/a
String.prototype.isvalidalphanumeric=function ()
{
var result=this.match (/^[a-za-z0-9]+$/);
if (result==null) return false;
return true;
}

Function name:isvalidstring
Function Description: Determines whether the input is a by 0-9/A-z/A-z/. /_ A string consisting of
Creation Date:2004-7-13 10:20
Last Modify by:n/a
Last Modify date:n/a
String.prototype.isvalidstring=function ()
{
var result=this.match (/^[a-za-z0-9\s.\-_]+$/);
if (result==null) return false;
return true;
}

Function Name:isvalidpostalcode
Function Description: Determines whether the input is a valid ZIP code
Creation Date:2004-7-13 10:22
Last Modify by:n/a
Last Modify date:n/a
String.prototype.isvalidpostalcode=function ()
{
var result=this.match (/(^[0-9]{6}$)/);
if (result==null) return false;
return true;
}

Function Name:isvalidphoneno
Function Description: Determines whether the input is a valid phone number
Creation Date:2004-7-13 10:22
Last Modify by:n/a
Last Modify date:n/a
String.prototype.isvalidphoneno=function ()
{
var result=this.match (/(^[0-9]{3,4}\-[0-9]{3,8}$) | ( ^[0-9]{3,8}$) | (^\ ([0-9]{3,4}\) [0-9]{3,8}$)/);
if (result==null) return false;
return true;
}

Function Name:isvalidmobileno
Function Description: Determines whether the input is a valid cell phone number
Creation Date:2004-7-13 10:23
Last Modify by:n/a
Last Modify date:n/a
String.prototype.isvalidmobileno=function ()
{
var result=this.match (/(^0{0,1}13[0-9]{9}$)/);
if (result==null) return false;
return true;
}